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Don't cache stable hashes in types outside of incremental mode

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This commit is contained in:
Oli Scherer 2022-02-24 13:43:23 +00:00
parent 8d4f4e42af
commit 8b0440a669
2 changed files with 19 additions and 3 deletions
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16
compiler/rustc_middle/src/ty/mod.rs
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@ -464,8 +464,20 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Ty<'tcx> {
stable_hash,
} = self.0.0;
assert_ne!(*stable_hash, Fingerprint::ZERO, "{:#?}", kind);
stable_hash.hash_stable(hcx, hasher);
if *stable_hash == Fingerprint::ZERO {
// No cached hash available. This can only mean that incremental is disabled.
// We don't cache stable hashes in non-incremental mode, because they are used
// so rarely that the performance actually suffers.
let stable_hash: Fingerprint = {
let mut hasher = StableHasher::new();
kind.hash_stable(hcx, &mut hasher);
hasher.finish()
};
stable_hash.hash_stable(hcx, hasher);
} else {
stable_hash.hash_stable(hcx, hasher);
}
}
}